intersect/test/test.js

Find the intersection of two arrays

var test = require('tape');
var intersect = require('..');

test('intersect', function (t) {
  t.deepEqual(intersect([1], [2]), [], 'empty');
  t.deepEqual(intersect([1, 2], [2]), [2], 'intersection');
  t.end();
});

test('big', function (t) {
  t.deepEqual(intersect.big([1], [2]), [], 'empty');
  t.deepEqual(intersect.big([1, 2], [2]), [2], 'intersection');
  t.end();
});

test('compliance', function(t) {
  for (var algo in intersect) {
    if (intersect.hasOwnProperty(algo) && typeof intersect[algo] === 'function') {
      t.deepEqual(intersect[algo]([2], [2,2,2]), intersect([2], [2,2,2]), algo + '-complies-1');
      t.deepEqual(intersect[algo]([2,2,2], [2]), intersect([2,2,2], [2]), algo + '-complies-2');
    }
  }
  t.end();
});

test('multiple sets at once', function (t) {
  [intersect, intersect.big].forEach(function (fn) {
    t.deepEqual(
      fn([
        [1, 2, 3, 4, 6],
        [2, 4, 5, 6],
        [2, 5, 6]
      ]),
      [2,6]
    );
    t.deepEqual(
      fn([
        [1, 2, 3, 4, 6],
        [2, 4, 5, 6],
        [2, 5, 6],
        [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
      ]),
      [2,6]
    );
    t.deepEqual(
      fn([
        [1, 2, 3, 4, 6],
        [2, 5, 6]
      ]),
      [2,6]
    );
    t.deepEqual(
      fn([
        [1, 2, 3, 4, 6],
        [2, 5, 6]
      ]),
      [2,6]
    );
    t.deepEqual(
      fn([
        [2, 5, 6]
      ]),
      [2, 5, 6]
    );

    t.deepEqual(
      fn([]),
      []
    );

  });
  t.end();
});